Massachusetts: 1-800-233-5325 and 911Rhode Island: 1-800-640-1595 and 911
New York:
Long Island and the Rockaways:
1-800-490-0045 and 911
Metro NY: 911 and 1-718-643-4050
Upstate NY: 1-800-892-2345 and 911

Natural gas utilities add a distinctive, sulfur-like odor to natural gas to help people detect leaks.
However, in some cases you may not be able to smell this odor. And gas in transmission pipelines may not be odorized.

Do not rely on your nose alone to detect a gas leak.
Use your senses of sight and hearing as well. Here are the signs:

A hissing, whistling or roaring sound as gas escapes from a pipe

Dirt blowing into the air from a hole in the ground

Continuous bubbling in water

A damaged connection to a gas appliance

Exposed pipeline after a fire, flood or other disaster

Use your senses of smell, sight and hearing to detect natural gas leaks.